How we score
We grade every strain, ingredient, and product on the same evidence-first rubric, then name the trade-offs.
| What we weigh | Weight | Why it matters |
|---|---|---|
| Evidence quality | 30% | The strength of the clinical and microbiome research behind a strain or ingredient. |
| Strain specificity | 25% | Whether the exact strains are named and matched to the evidence, not just the species. |
| CFU & dose | 20% | Guaranteed live CFUs per serving through end of shelf life, checked against the label. |
| Safety & tolerability | 15% | The safety record at label doses for everyday use. |
| Value & availability | 10% | Cost per effective serving. |
We cover the whole category and let a competitor win where it genuinely earns it — believable losses are what make our wins worth trusting.
This site is for general education and is not veterinary advice. Supplements support normal structure and function; they are not intended to diagnose, treat, cure, or prevent any disease.